Effectiveness of a COVID-19 Additional Primary or Booster Vaccine Dose in Preventing SARS-CoV-2 Infection Among Nursing Home Residents During Widespread Circulation of the Omicron Variant – United States, February 14-March 27, 2022
Summary What is already known about this topic? Nursing home residents are at high risk for COVID-19–associated morbidity and mortality. Little is known about the